The singer has been wearing Dolce & Gabbana looks for a London residency with Harry Styles.Credit: GettyShania Twain is mid-way through an historic London residency that sees her opening for all twelve of Harry Styles's shows at Wembley in the UK capital this summer. The 60-year-old singer has been wearing an array of bold, sultry looks for her performances, all courtesy of Dolce & Gabbana. Twain took a moment to reflect on the power of a good '…